JP2013250401A - Key depression switch of electronic piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key depression switch of a pseudo-action device capable of feeling a damper load as a touch feeling only by slightly improving a contact part of a pseudo-hammer.SOLUTION: In an electronic piano, projections 51A, 51B are provided by being arranged in the cross direction on the surface on the side of a pseudo-hammer 5 of a movable part 45 of a switch body 30. In key depression, when the pseudo-hammer 5 rotates, it contacts the projection 51B first, and after that, contacts the projection 51A near a rotation supporting point of the movable part 45. Timing when the projections 51A, 51B contacting the pseudo-hammer 5 move is the same as timing when a load becomes heavier due to a damper load. Thus, during rotation of the pseudo-hammer 5, a position where the pseudo-hammer 5 contacts the movable part 45 is moved to a position near a supporting point of the movable part 45, and making the load to be applied to the pseudo-hammer 5 heavier, a player can be made to feel as if the damper load is applied during the key depression.

Description

  The present invention relates to a key switch of an electronic piano that detects a key pressing operation.

When a key is pressed on an acoustic piano, it is well known to draw a static touch characteristic (grand piano) as shown in FIG.
On the other hand, since an electronic piano does not have an action like an acoustic piano, the electronic piano has a pseudo action, and is devised so that a static touch characteristic similar to that of an acoustic piano can be obtained when a key is pressed.

  For example, as shown in FIG. 6, the electronic piano includes a let-off component 6 as a component constituting a pseudo action in order to obtain a let-off feeling that is a static touch characteristic of an acoustic piano.

  In the electronic piano provided with the let-off component 6, the pseudo hammer 5 is lifted when the key is depressed, and the engagement protrusion 27 attached to the hammer 5 touches the let-off component 6 at the timing when the let-off occurs. By doing so, a let-off feeling was given (Patent Document 1).

JP 2010-262129 A

However, the static touch characteristics of an acoustic piano include not only the let-off feeling but also various load changes as shown in FIG.
For example, in the static touch characteristics shown in FIG. 5, the load becomes constant immediately after the key is pressed, but there is a phenomenon that the load is increased before the let-off occurs, and the load becomes constant in the raised state.

  In the case of an upright piano, the damper spoon attached to the rear end of the wippen is a load applied when the damper lever comes in contact with the damper lever, and in the case of a grand piano, the rear end of the key pushes up the damper lever, This is a load applied when the damper is separated from the string (hereinafter referred to as “damper load”).

In this regard, conventional dampers cannot feel such a damper load as a touch feeling.
On the other hand, the conventional electronic piano is provided with a switch 100 for detecting the operation of the pseudo hammer 5 as shown in FIG.

  The switch 100 includes a switch main body 101 in which the non-player side rotates in the vertical direction with the performer side as a fulcrum, and one protrusion 102 is provided at a portion in contact with the pseudo hammer 5.

  In this electronic piano, when the key is pressed, the pseudo hammer 5 is lifted, and the switch body 101 is pressed by the pseudo hammer 5 through the protrusion 102, thereby detecting the presence and strength of the key press. .

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pseudo key pressing switch for an action device that can feel a damper load as a touch feeling with only a slight improvement in the contact portion with the pseudo hammer.

  The invention described in claim 1 that achieves the above object is a key pressing switch that is pressed by a pseudo hammer that swings in response to a key pressing operation and is used for estimating the key pressing state by detecting the pressing state. , With the player side serving as a fulcrum, the non-player side comes in contact with the pseudo-hammer and rotates on the main body, and the main body is in contact with the pseudo-hammer. In the case of an acoustic piano, the first contact portion that is in contact with the key pressing amount before starting to be applied, and the position closer to the fulcrum than the first contact portion is pressed. The second contact part that contacts when the key amount is set is set, and in the case of an acoustic piano, the contact with the pseudo hammer when the key press amount is from when the damper load starts to be applied. But wherein the from the first contact portion and a contact portion that moves in the second contact portion.

  According to this, in the case of an acoustic piano, the contact position with the main body portion of the pseudo hammer is changed from the first contact portion to the main body portion from the first contact portion in accordance with the timing when the key pressing amount increases due to the damper load. The contact position has moved to the second contact portion close to the fulcrum.

  Thus, when the position where the pseudo hammer contacts the main body moves to a position close to the fulcrum of the main body, the load applied to the pseudo hammer becomes actually heavy, that is, the player also has a heavy force on the key. You will feel that.

In addition, if the timing at which this load increases is an acoustic piano, the player feels that the damper load has been applied because the amount of key depression to which the damper load is applied.
Therefore, when an electronic piano is configured using the key depression switch of the present invention, the performer can perform with a sense closer to an acoustic piano than a conventional electronic piano.

In addition, when an electronic piano is configured using the key pressing switch of the present invention, the load actually increases during the key pressing operation, so that the key can be quickly returned when the key is returned, and the repeatability is improved.
Furthermore, if the load does not increase in this way, when the key is played weakly, the key will be pushed down with the force applied to the key first and the key will fall, making it difficult to produce a weak sound. If the load increases in the middle of pressing the key, the key will not drop, making it easier to make a weak sound.

  Next, the shape of the contact portion may be any shape such as a shape having three or more protrusions. However, in order to obtain a simple shape, the first contact portion is defined as described in claim 2. It is good also as what consists of the 1st processus | protrusion to form and the 2nd processus | protrusion which forms a 2nd contact part.

  Note that, as described in claim 3, the key pressing switch may be a switch that is turned on in the order of the first switch, the second switch, and the third switch when the key pressing switch is rotated about the fulcrum. However, the number of switches may be two or more.

It is a side view of one keyboard apparatus among 88 keyboard apparatuses with which the electronic piano of this embodiment is provided. (A) An upper perspective view of a switch, (b) A lower perspective view of a switch. It is sectional drawing of a switch main body. This cross-sectional view is a cross-sectional view of the switch main body shown in FIG. 1, and is a cross-sectional view when the switch main body is cut at the center in the width direction in the left-right direction using the cross-section along the vertical direction. . It is a top view of a switch. It is a graph which shows the static touch characteristic of an acoustic piano. It is the enlarged view of the action with which the conventional electronic piano is equipped, and is drawing which extracted the structure of the part which a pseudo hammer hits a let-off component.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the electronic piano 1 includes a key 2, a keyboard chassis 3 that supports the key 2, a hammer support 4 that is connected to the rear end (right side in FIG. 1) of the keyboard chassis 3, A pseudo hammer 5 that rotates in conjunction with the depressed key 2 is provided.

The electronic piano 1 also includes a let-off component 6 that gives a let-off feeling when the key 2 is depressed, a key switch 7 that detects key depression information of the key 2, and the like.
Although FIG. 1 shows only the structure related to one white key, the electronic piano 1 is arranged in the left and right direction (direction perpendicular to the paper surface of FIG. 1) viewed from the performer. There are 88 keys, including keys.

Next, the configuration of the electronic piano 1 having the above-described configuration will be further described.
The keyboard chassis 3 includes three support rails 9 including a front rail 9a, a middle rail 9b, and a rear rail 9c extending in the left-right direction, and five reinforcing ribs 10 (only one is shown in FIG. 1). Is not assembled) and is fixed on a shelf (not shown).

  A heel front 11 and a heel center 12 are fixed to the lower surface of the front rail 9a and the upper surface of the middle rail 9b. The saddle front 11 and the saddle center 12 extend in the left-right direction (direction perpendicular to the paper surface of FIG. 1) over the entire front rail 9a and middle rail 9b.

  Two balance pins 13 erected upward from the upper surface of the cage 12 are juxtaposed along the longitudinal direction of the key 2. In addition, two front pins 14 erected upward from the upper surface of the front 11 are also juxtaposed along the longitudinal direction of the key 2.

  The key 2 has a balance pin hole 17 formed from the rear side in the center in the longitudinal direction, and the balance pin 13 is inserted into the balance pin hole 17 so as to be swingable with respect to the cage 12. Placed.

  Further, a front pin hole 18 is formed at the front end portion of the key 2, and when the front pin 14 is inserted into the front pin hole 18, the key 2 may shake in the left-right direction when swinging. Is prevented.

  The hammer support 4 is formed by connecting a plurality of molded products for one octave, for example, and extends in the left-right direction so as to cover the pseudo-hammer 5 and is screwed to the rear rail 9 c of the keyboard chassis 3.

The hammer support 4 is composed of a hammer support portion 19 standing upright from the vicinity of the rail 9c and a switch mounting portion 20 extending obliquely upward from the upper end portion.
A horizontal pin-shaped fulcrum shaft portion 21 for supporting each pseudo hammer 5 is formed at the upper end portion of the hammer support portion 19.

The pseudo-hammer 5 includes an arm-shaped hammer body 22 extending in the front-rear direction and a weight plate 23 attached to the front end portions of the left and right side surfaces.
The hammer body 22 is made of a synthetic resin, and the weight plate 23 is made of a metal material such as iron.

  An arc-shaped shaft hole 24 is formed at the rear end portion of the hammer body 22, and the pseudo hammer 5 is rotatable to the hammer support 4 by engaging the shaft hole 24 with the fulcrum shaft portion 21. It is supported by.

A capstan screw 25 is screwed into the lower surface of the hammer body 22 at a position immediately in front of the shaft hole 24.
The pseudo hammer 5 is placed on the rear end of the key 2 via the capstan screw 25.

A portion between the shaft hole 24 on the upper surface of the hammer body 22 and the capstan screw 25 is an actuator 26 for operating the key switch 7 when the key is depressed.
Furthermore, a plate-like engagement protrusion 27 that engages with the let-off component 6 when a key is pressed is provided at the center of the upper surface of the hammer body 22 in the front-rear direction.

  The let-off component 6 is formed of a molded product of a predetermined elastic material (for example, a styrene-based thermoplastic elastomer), and is attached to the switch attachment portion 20 of the hammer support 4.

The let-off component 6 extends obliquely downward from the front end portion of the switch mounting portion 20, and a head portion 28 is formed at the free end portion via a constricted portion.
The head 28 faces the engagement protrusion 27 of the pseudo hammer 5 in the key release state.

The key switch 7 includes a switch main body 30 formed of a rubber switch. The switch main body 30 is attached above the actuator 26 of the pseudo hammer 5.
The switch body 30 faces the actuator 26 of the pseudo hammer 5 with a gap in the key release state.

Furthermore, a hammer stop 31 made of urethane foam or the like that restricts the upward rotation of the pseudo hammer 5 is provided at the foremost end of the lower surface of the switch mounting portion 20.
[switch]
Next, members constituting the key switch 7 according to the present invention will be described in detail. As shown in FIG. 2 (a), the electronic piano 1 of this embodiment includes a switch body unit 43, and this switch body. The unit 43 is formed by integrally forming a base 41, four switch bodies 30 provided side by side on the base 41, and a plurality of leg portions 42 provided on the lower surface of the base 41.

  Since the switch body unit 43 includes four switch bodies 30 constituting the key switch 7 of each key 2, the electronic piano 1 as a whole includes 22 switch body units 43.

  Each switch body 30 constituting the switch body unit 43 includes a movable portion 45 (corresponding to the body portion of the present invention) formed in an oblong planar shape elongated in the front-rear direction, and a base as shown in FIG. As shown in FIG. 2 (b), the entire peripheral wall portion 44 that rises from 41 and supports the movable portion 45 is formed in a dome shape.

As shown in FIG. 2A, the surface of the movable portion 45 is formed in a shape inclined forward toward the front side (right side of FIG. 2A) when the upper surface of the base 41 is used as a reference.
The movable portion 45 is formed with three cylindrical concave portions 46 to 48 arranged in the front-rear direction. As shown in FIG. 3, from the lower edge of the concave portions 46 to 48, the thin portion 49 is interposed. The first to third switch elements S1 to S3 are respectively suspended.

First to third movable contacts CM1 to CM3 made of carbon are provided at lower ends of the first to third switch elements S1 to S3, respectively.
The movable portion 45 is provided with a support protrusion 50 on the front side of the first switch element S1.

Furthermore, two protrusions 51 </ b> A and 51 </ b> B arranged in the front-rear direction are provided on the left and right sides of the central recess 47 on the surface of the movable portion 45.
These protrusions 51A and 51B have a substantially semicircular side shape, and their sizes are the same.

  As shown in FIG. 3, the switch body 30 configured as described above is attached to the lower surface of the switch board 29 by inserting the plurality of leg portions 42 into the respective holes 52 provided in the switch board 29.

  In the key release state of the key 2, the actuator 26 of the pseudo hammer 5 is opposed to the protrusion 51 </ b> B on the rear side of the switch body 30. FIG. 3 shows a state immediately after the actuator 26 comes into contact with the protrusion 51B as the key is pressed.

  Further, in the key release state, the support protrusion 50 of the movable portion 45 is opposed to the switch substrate 29 and the first to third movable contacts CM1 to CM3 are formed on the switch substrate 29 for each switch body 30. 4 are arranged so as to face the first to third fixed contacts CS1 to CS3 as shown in FIG.

The distance between the contacts is shorter for the front CM1 and CS1.
Each of the first to third fixed contacts CS1 to CS3 includes two electrodes, and it is determined that the switch is turned on by connecting the first to third movable contacts CM1 to CM3. .

The key switch 7 for each key 2 includes the switch body 30 and first to third fixed contacts CS1 to CS3.
[Key press operation]
Next, the operation of the electronic piano 1 having the above configuration will be described with reference to FIG. 1 mainly with reference to FIGS.

  When the key 2 is pressed, the key 2 is rotated counterclockwise on the paper surface of FIG. 1 with the center of the hook 12 as a fulcrum, and the pseudo hammer 5 is pushed up via the capstan screw 25 accordingly. The actuator 26 starts to rotate clockwise around the fulcrum shaft 21, the actuator 26 comes into contact with the rear projection 51 </ b> B of the switch body 30, and the switch body 30 starts to be pushed.

Thereafter, the peripheral wall portion 44 is deformed, the support protrusion 50 comes into contact with the switch substrate 29, and the movable portion 45 starts to rotate about the support protrusion 50 as a fulcrum.
If the key depression amount is further increased and the acoustic piano is used, the actuator 26 starts to contact the projection 51A closer to the support projection 50 than the projection 51B when the damper load starts to be applied. It becomes like this.

  Then, the ratio of the load received by each of the protrusions 51B and 51A from the pseudo-hammer 5 starts to change, and the amount of key depression increases further. In the case of an acoustic piano, the amount of key depression applied to the damper load is increased. The movable portion 45 is pushed and rotated by the pseudo hammer 5 only through the protrusion 51A.

  That is, in the electronic piano 1 of the present embodiment, in the case of an acoustic piano, the position of the movable portion 45 in contact with the pseudo hammer 5 is adjusted from the protrusion 51B in accordance with the timing at which the key pressing amount increases due to the damper load. The projection 51A is moved closer to the support projection 50 than 51B.

  Thus, if the position where the pseudo hammer 5 contacts the movable portion 45 moves to a position close to the support protrusion 50 in the middle of the key depression, the load applied to the pseudo hammer 5 increases along with this movement. It feels as if a damper load was applied.

  Thereafter, as soon as the movable portion 45 starts to be pushed through the protrusion 51A, as shown in FIG. 3, the first movable contact CM1 comes into contact with the first fixed contact CS1, and further the movable portion 45 rotates. Then, when the first switch S1 is pushed into the recess 46, the first fixed setting CM2 comes into contact with the second fixed contact CS2, and the movable portion 45 is further rotated, the second switch S2 is pushed into the recess 47. Thus, the third movable contact CM3 contacts the third fixed contact CS3.

  Further, in the case of an acoustic piano after the movable part 45 starts to be pushed by the protrusion 51A, when the let-off timing is reached, the engaging protrusion 27 engages with the head 28 of the let-off component 6, and further, When the hammer 5 rotates, the engaging protrusion 27 presses while compressing the head 28 of the let-off component 6, and when the pseudo hammer 5 further rotates, the engaging protrusion 27 eventually becomes the head of the let-off component 6. 28.

  Then, by the increase and disappearance of the reaction force received from the let-off component 6, the player who is playing the electronic piano 1 of the present embodiment can feel a let-off feeling similar to an acoustic piano.

  In the electronic piano 1 of the present embodiment, when the first to third switches S1 to S3 are turned on, the key number of the depressed key 2 and the on-time difference between the first to third switch elements S1 to S3 are determined. Then, the rotation speed of the pseudo hammer 5 is calculated, and on the basis of the result, a sound is generated according to the scale of each key 2 having strength and weakness.

Thereafter, when the pseudo hammer 5 comes into contact with the hammer stop 31, the upward rotation of the pseudo hammer 5 is completed, and when the key 2 is released, the key 2 is rotated in the opposite direction to that when the key is depressed. 1 returns to the key release state, and accordingly, the pseudo hammer 5 also rotates downward to return to the key release state.
[Characteristic effects of the electronic piano 1 of this embodiment]
In this embodiment, while the pseudo hammer 5 is rotating, the position where the pseudo hammer 5 contacts the movable portion 45 is moved to a position near the fulcrum of the movable portion 45 so that the load applied to the pseudo hammer 5 is increased. The player can feel as if a damper load is applied.

Therefore, when the electronic piano 1 of the present embodiment is used, the performer can perform with a sense closer to an acoustic piano than a conventional electronic piano.
In addition, when the load is applied in this manner, the key 2 is returned faster when the key 2 is returned, so that the electronic piano 1 of the present embodiment has a better hitting performance than the conventional electronic piano.

In addition, if the load does not increase in this way when the key is pressed, when the key is played weakly, the key is pushed down by the force applied to the key first and the key falls, making it difficult to produce a weak sound. In the electronic piano 1 of the form, the load becomes heavy in the middle of pressing the key, and the key does not drop, so a weak sound is likely to be produced.
(Conclusion)
The present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Electronic piano 2 ... Key 3 ... Keyboard chassis 4 ... Hammer support 5 ... Pseudo hammer 6 ... Let-off component 7 ... Key switch 9 ... Support rail 9a ... Front rail 9b ... Middle rail 9c ... Rear rail 10 ... Rib 11 ... Front 12 ... Saddle 13 ... Balance pin 14 ... Front pin 17 ... Balance pin hole 18 ... Front pin hole 19 ... Hammer support part 20 ... Switch mounting part 21 ... Support shaft part 22 ... Hammer body 23 ... Weight plate 24 ... Shaft hole 25 ... Capstan screw 26 ... Actuator part 27 ... Engagement projection 28 ... Head 29 ... Switch board 30 ... Switch body 31 ... Hammer stop 41 ... Base 42 ... Leg part 43 ... Switch body unit 44 ... Peripheral wall part 45 ... Movable part 46 48 ... Concavity 49 ... Thin part 50 ... Support protrusion 51A ... Protrusion 51B ... Projection 52 ... Hole

Claims (3)

In a key pressing switch of an electronic piano that is pressed by a pseudo hammer that swings according to a key pressing operation and is used to estimate the key pressing state by detecting the pressing state,
With the performer side as a fulcrum, the non-player side comes into contact with the pseudo-hammer and rotates.
A first contact portion that is provided at a portion of the main body portion that comes into contact with the pseudo-hammer and is in contact with the key press amount before the damper load starts to be applied to an acoustic piano, and from the first contact portion, If it is set to a position close to the fulcrum, and the acoustic piano has a damper load, the second contact part that contacts when the key is pressed is set, and if it is an acoustic piano, the damper load starts to be applied. A key pressing switch, comprising: a contact portion that moves to the second contact portion from the first contact portion when the key press amount is as large as possible. The key pressing switch according to claim 1, wherein
The contact portion is
A first protrusion forming the first contact portion;
A key pressing switch comprising: a second protrusion forming the second contact portion. The key pressing switch according to any one of claims 1 and 2,
A key pressing switch, wherein the switch is turned on in the order of the first switch, the second switch, and the third switch when rotated about the fulcrum.

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